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Intangible Asset and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in carrying amount of goodwill by reporting unit
The following tables present goodwill information for each of the reportable segments for the six months ended June 30, 2018:
Reportable Segment:
 
As of December 31, 2017
 
Effect of Exchange Rates (1)
 
As of June 30, 2018
 
 
(In thousands)
MID
 
$
66,643

 
$
—

 
$
66,643

RSD
 
143,018

 
(981
)
 
142,037

Total
 
$
209,661

 
$
(981
)
 
$
208,680

(1) Effect of exchange rates relates to foreign currency translation adjustments for the period.
 
 
 
As of
 
 
June 30, 2018
Reportable Segment:
 
Gross Carrying Amount
 
Accumulated Impairment Losses
 
Net Carrying Amount
 
 
(In thousands)
MID
 
$
66,643

 
$
—

 
$
66,643

RSD
 
142,037

 
—

 
142,037

Other
 
21,770

 
(21,770
)
 
—

Total
 
$
230,450

 
$
(21,770
)
 
$
208,680
Components of intangible assets
The components of the Company’s intangible assets as of June 30, 2018 and December 31, 2017 were as follows:
 
 
 
As of June 30, 2018
 
Useful Life
 
Gross Carrying
 Amount (1)
 
Accumulated
 Amortization
 
Net Carrying
 Amount
 
 
 
(In thousands)
Existing technology
3 to 10 years
 
$
259,465

 
$
(206,160
)
 
$
53,305

Customer contracts and contractual relationships
1 to 10 years
 
68,377

 
(52,342
)
 
16,035

Non-compete agreements and trademarks
3 years
 
300

 
(300
)
 
—

In-process research and development
Not applicable
 
1,600

 
—

 
1,600

Total intangible assets
 
 
$
329,742


$
(258,802
)
 
$
70,940

 
 
 
As of December 31, 2017
 
Useful Life
 
Gross Carrying
 Amount (1)
 
Accumulated
 Amortization
 
Net Carrying
 Amount
 
 
 
(In thousands)
Existing technology
3 to 10 years
 
$
258,008

 
$
(191,554
)
 
$
66,454

Customer contracts and contractual relationships
1 to 10 years
 
68,794

 
(48,626
)
 
20,168

Non-compete agreements and trademarks
3 years
 
300

 
(300
)
 
—

In-process research and development
Not applicable
 
5,100

 
—

 
5,100

Total intangible assets
 
 
$
332,202

 
$
(240,480
)
 
$
91,722



(1) The change in gross carrying amount reflects the effects of exchange rates during the period.

Estimated future amortization expense of intangible assets
The estimated future amortization of intangible assets as of June 30, 2018 was as follows (amounts in thousands):
Years Ending December 31:
Amount
2018 (remaining 6 months)
$
9,886

2019
20,355

2020
20,537

2021
13,185

2022
2,006

Thereafter
3,371

Total amortizable purchased intangible assets
$
69,340

In-process research and development
1,600

Total intangible assets
$
70,940